Method for rectification and separation of benzoic acid, benzaldehyde, and toluene by single tower sidestream

A technology of benzaldehyde and benzoic acid, applied in the field of benzaldehyde, benzoic acid, and toluene extraction, can solve the problems of high production cost, low yield, high energy consumption, etc., and achieve short reaction cycle, simple operation, and low energy consumption Effect

Active Publication Date: 2013-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Obviously, the traditional process requires 2 to 3 rectification towers to obtain benzoic acid, benzaldehyde, and toluene. The equi

Method used

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  • Method for rectification and separation of benzoic acid, benzaldehyde, and toluene by single tower sidestream

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The toluene oxidation reaction solution in this experiment was from Sinopec Shijiazhuang Refining and Chemical Company, and the feed temperature of the reaction solution was 25°C. The number of trays in the rectification column is 96, the toluene reaction solution is fed in the 25th tray of the rectification column, the outlet of the side line D-1 is the first tray, and the outlet of the side line D-2 is the 40th tray. Add the reaction liquid after oxidation of toluene to the rectification tower, and start heating when the liquid level reaches 1 / 3 of the tower tank; The temperature at -2 is 175-178°C, and the temperature at side line D-3 is 240-245°C; adopt the continuous intermediate feeding method, continuously add toluene reaction liquid to the rectification tower, and adjust the reflux ratio at side line D-1 to 5 , the reflux ratio at the side line D-2 is 2 to 4, the reflux ratio at the side line D-3 is 1 to 3, the side line D-1 distillate is toluene with a mass con...

Embodiment 2

[0022] The toluene oxidation reaction solution in this experiment was from Sinopec Shijiazhuang Refining and Chemical Company, and the feed temperature of the reaction solution was 25°C. The number of trays in the rectification column is 96, the toluene reaction liquid is fed on the 30th tray of the rectification column, the outlet of the side line D-1 is the first tray, and the outlet of the side line D-2 is the 45th tray. Add the reaction liquid after oxidation of toluene to the rectification tower, and start heating when the liquid level reaches 1 / 3 of the tower tank; The temperature at -2 is 177-180°C, the temperature at side line D-3 is 249-255°C; adopt continuous intermediate feeding method, continuously add toluene reaction liquid to the rectification tower, and adjust the reflux ratio at side line D-1 to 5 , the reflux ratio at the side line D-2 is 2 to 4, the reflux ratio at the side line D-3 is 1 to 3, the side line D-1 distillate is toluene with a mass content of 96...

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Abstract

A method for rectification and separation of benzoic acid, benzaldehyde, and toluene by a single tower sidestream comprises the following steps: firstly adding a toluene liquid phase catalytic oxidation reaction solution into a tower kettle of a sidestream rectifying tower, heating when the liquid level reaches1/3-1/2 of the tower kettle height; when the device reaches total reflux, adjusting the temperature at the sidestream D-1 to 110-112 DEG C, the temperature at the sidestream D-2 to 177-180 DEG C, and the temperature at the sidestream D-3 to 249-255 DEG C from up to down; adding a reaction solution after toluene oxidation into the rectifying tower in a continuous intermediate charging mode, adjusting a reflux ratio to 3-5, wherein the sidestream D-1 distillate is toluene, the sidestream D-2 distillate is benzaldehyde, and the sidestream D-3 distillate is benzoic acid. The tower plate number of the rectifying tower is 96 or more than 96, but less than 110, and the raw material of the toluene oxidation reaction solution is preferably charged at the 25th-30th plate; the sidestream D-1 discharging port is the first tower plate, and the sidestream D-2 discharging port is the 40th-45th tower plate; the sidestream D-3 is the tower bottom.

Description

technical field [0001] The invention relates to a method for separating toluene oxidation reaction liquid, in particular to a method for extracting toluene, benzaldehyde and benzoic acid from toluene oxidation reaction liquid. Background technique [0002] In the traditional technology, the separation and purification of benzoic acid is used to prepare caprolactam. After catalytic oxidation of toluene, about 25% (mass fraction, the same below) of benzoic acid solution, about 5% benzaldehyde, about 65% toluene, and about 3% benzene Methanol, about 5% water, and a small amount of impurities such as acetophenone, biphenyl, and methyl biphenyl. As the market application of benzaldehyde becomes more and more extensive, the utilization rate of benzaldehyde is getting higher and higher. Therefore, extracting about 5% benzaldehyde while extracting benzoic acid increases the economic profit of the enterprise. The comparatively common method mainly adopts two rectifying towers to se...

Claims

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Application Information

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IPC IPC(8): C07C63/06C07C51/44C07C47/54C07C45/82C07C15/06C07C7/04
CPCY02P20/52
Inventor 周永兵刘建新陈韶辉杨爱武高洪伟肖翔
Owner CHINA PETROLEUM & CHEM CORP
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